CN104446486B - A kind of resistance to thermal shock pottery pipe die and preparation method thereof - Google Patents
A kind of resistance to thermal shock pottery pipe die and preparation method thereof Download PDFInfo
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- CN104446486B CN104446486B CN201410598766.4A CN201410598766A CN104446486B CN 104446486 B CN104446486 B CN 104446486B CN 201410598766 A CN201410598766 A CN 201410598766A CN 104446486 B CN104446486 B CN 104446486B
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- 230000035939 shock Effects 0.000 title claims abstract description 41
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
- 239000010959 steel Substances 0.000 claims abstract description 48
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 38
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 36
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 18
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 18
- 235000013312 flour Nutrition 0.000 claims abstract description 16
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 16
- 229910001928 zirconium oxide Inorganic materials 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229960000935 dehydrated alcohol Drugs 0.000 claims abstract description 11
- 239000011859 microparticle Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 54
- 239000000203 mixture Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 11
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 239000011280 coal tar Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 7
- 239000003265 pulping liquor Substances 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910021418 black silicon Inorganic materials 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 4
- 239000011863 silicon-based powder Substances 0.000 claims description 4
- 238000010411 cooking Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910017083 AlN Inorganic materials 0.000 claims description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 238000009490 roller compaction Methods 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 19
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 29
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Abstract
The invention belongs to metallurgical casting and field of smelting, particularly disclose a kind of resistance to thermal shock pottery pipe die and preparation method thereof.This resistance to thermal shock pottery pipe die, including mould in earthenware, in earthenware, mould outer sheath is provided with steel pipe die crust, is filled with self-flow refractory castable in earthenware between mould and steel pipe die crust；In described earthenware, mould includes that the raw material of following percentage by weight is made: silicon carbide micro-powder 40 50%, silica flour 20 25%, first aluminum nitride powder 20 25%, graphite microparticles 2 5%, zirconium oxide micropowder 2 3%, yittrium oxide micropowder 0.5 1%, dehydrated alcohol 0.2 0.5% and binding agent 3 4%.Resistance to thermal shock pottery pipe die compressive resistance of the present invention is high, rupture strength is good, high-temperature corrosion resistance performance is good, pipe die service life can be extended, use resistance to thermal shock pottery pipe die of the present invention to produce ductile iron pipe and can reduce production link, save the energy, save equipment maintenance cost, reduce production cost, significant to metallurgical cast tube industry, have broad application prospects and promotional value.
Description
(1) technical field
The invention belongs to metallurgical casting and field of smelting, particularly to a kind of resistance to thermal shock pottery pipe die and preparation method thereof.
(2) background technology
Intensity is high, plasticity is good, corrosion resistance and good, length in service life, construction cost because having for Centrifugal Casting Pipe of S. G. Iron
City and industry drainage pipeline it is widely used in by the advantage such as low.The mould that Centrifugal Casting Pipe of S. G. Iron is used
In, most important parts are pipe dies, and the quality quality of pipe die directly affects the quality of the ductile iron pipe cast out by it, and
The expense of pipe die occupies sizable ratio in cast tube cost, and its consumption costs directly affects the cost of cast tube.Therefore,
The quality of pipe die, cost and life-span are directly connected to the quality of Centrifugal Casting Pipe of S. G. Iron product and the economic effect of enterprise
Benefit.
At present, the pipe die that China's Centrifugal Casting Pipe of S. G. Iron uses is generally steel pipe die, centrifugal casting spheroidal graphite cast-iron
Pipe production technology can be divided into again chill method spun cast pipe technology and thermodyn process spun cast pipe technology by the use state of steel pipe die.
In chill method spun cast pipe technology, steel pipe die inner surface is up to the height of 1250-1300 DEG C due to direct and temperature
Temperature molten iron contacts and can reach its limit used, and is embodied as: high temperature can make the crystalline substance of steel pipe die inner surface alloy structure
Between low-melting compound liquefaction, formed intergranular corrosion cracking and crack；High temperature can make the steel Ovshinsky of steel pipe die inner surface
Body, then produces structural stress cause steel pipe die to ftracture with structural transformation in temperature-fall period；High temperature can make steel
The steel of pipe die inner surface is oxidizable and cracks.Additionally, steel pipe die continuous anti-by cold-hot condition during cast tube
Multiple circulation, the particularly cold and hot temperature difference of pipe die inner surface are big, cause thermal stress constantly to be gathered, and form stress corrosion cracking；And manage
The bigger steel pipe die in footpath is difficult to process, and the various defects in matrix are difficult to avoid, and this is all the formation of crack causing crackle to produce.
Steel pipe die inwall cracks and may result in the ductile iron pipe producing quality dissatisfaction in casting cycle, such steel pipe die
Will be scrapped.Even if the inner surface of steel pipe die is carried out repairing with proper extension its service life by polishing, built-up welding,
But maintenance cost is the highest, and also polluting environment, wherein noise pollution is the deepest.Take the cast tube duration, reduce production efficiency,
Therefore, in chill method spun cast pipe technique, the life-span of steel pipe die is relatively short, and the consumption costs of pipe die is the highest；The opposing party
Face, during chill method spun cast pipe, in order to reduce the high temperature liquid iron damage to pipe die, needs to use recirculated cooling water from steel pipe die
Periphery reduces the temperature of steel pipe die, and wastes the own of high temperature cast tube during forcing cooling pipe die by recirculated water
Heat, makes molten iron comparatively fast cause body section to be air chill state due to rate of cooling, in addition it is also necessary to reoffer heat cast tube
Carry out continuous annealing and obtain required ductile iron pipe；And owing to needs use recirculated water that steel pipe die carries out cooling fall
Temperature, production technology is the highest to the sealing requirements of centrifuge, and water cooling tube die wants outer hoop high speed water to seal bearing, so may result in
The linear velocity of pipe die is limited, so not only centrifuge structure is complicated in chill method spun cast pipe technique, consuming cost is high, and
And the production of major diameter ductile iron pipe is also restrained.
Thermodyn process spun cast pipe technology, owing to being lined with resin sand at steel pipe die inwall or being sprayed with coating, has heat insulation effect
Really, and the thermal force making pipe die bear greatly reduces, and effectively extends service life, and steel pipe die inwall lining have every
Having heat insulation effect after the resin sand of thermal effect or coating, can reduce the own thermal loss of high temperature cast tube, the cast tube of production is only
Need to be through process annealing.But, the lining of resin sand and the spraying coating process of coating are complicated, and resin sand and coating are by high temperature liquid iron
After corrosion, in addition it is also necessary to repeat spraying, mechanization, the gentle production efficiency of Automated water are relatively low, pollute environment, and due in pipe die
Wall resin sand or the thickness of pipe die and coating quality are not easily controlled, and cause the outer surface of nodular cast iron pipe quality produced relatively
Difference, and between cast tube, outer surface quality discrepancy is relatively big, also can affect the quality of Centrifugal Casting Pipe of S. G. Iron product and enterprise
Economic benefit.
(3) summary of the invention
The present invention is in order to make up the deficiencies in the prior art, it is provided that a kind of compressive resistance is high, rupture strength corruption good, high temperature resistant
Performance is good in erosion, can extend pipe die service life, have heat accumulation function, simplify centrifuge set because being not required to circulating water cooling
Standby, cast tube can be made to utilize own heat complete nodularization, save the energy, reduce and produce ring by reasonably cooling and preservation and controlling
Joint, the resistance to thermal shock pottery pipe die saving equipment maintenance cost, reduction production cost and preparation method thereof.
The present invention is achieved through the following technical solutions:
A kind of resistance to thermal shock pottery pipe die, including mould in earthenware, in earthenware, mould outer sheath is provided with steel pipe die crust,
It is filled with self-flow refractory castable between mould and steel pipe die crust in earthenware；In described earthenware, mould includes following weight
The raw material of percentage ratio is made: silicon carbide micro-powder 40-50%, silica flour 20-25%, first aluminum nitride powder 20-25%, graphite microparticles 2-
5%, zirconium oxide micropowder 2-3%, yittrium oxide micropowder 0.5-1%, dehydrated alcohol 0.2-0.5% and binding agent 3-4%；Described bonding
Agent be any one in polyvinyl alcohol, coal tar, spent pulping liquor three with alumina cement, waterglass in any one
Combination.
Described silicon carbide micro-powder includes that silicon carbide micro-powder that particle diameter is 70-140 mesh and the carborundum that particle diameter is 35-50 mesh are micro-
Powder, wherein particle diameter be 70-140 mesh percentage by weight be 30-35%, remaining is silicon carbide micro-powder that particle diameter is 35-50 mesh；Described
The particle diameter of silica flour is 500 mesh；The particle diameter of described first aluminum nitride powder is 100-200 mesh；The particle diameter of described graphite microparticles is 600-
800 mesh；The particle diameter of described zirconium oxide micropowder is 500-800 mesh；The particle diameter of described yittrium oxide micropowder is 800 mesh.
Described silicon carbide micro-powder is green or black silicon carbide silicon powder.
Described first aluminum nitride powder is the aluminum nitride powder nitrogenized the most completely, be particle diameter be that the aluminium powder of 20 mesh is through not exclusively nitridation
After, being milled down to particle diameter is the mixing fine powders prepared after 100-200 mesh, and the ratio of aluminum nitride powder contained therein is 40-60%, residue
Composition is aluminium powder.
The preparation method of this resistance to thermal shock pottery pipe die, comprises the steps:
1) by silica flour, zirconium oxide micropowder, yittrium oxide micropowder, dehydrated alcohol and polyvinyl alcohol, coal tar, spent pulping liquor three
In any one mixing after, stir；
2) to step 1) mixture for preparing adds after silicon carbide micro-powder, graphite microparticles, it is sufficiently stirred for, mix homogeneously；
3) to step 2) mixture for preparing adds in alumina cement, both waterglass any one, stir
Rear addition water, the weight adding water is step 2) in the 4-7% of gross weight of mixture for preparing, be sufficiently stirred for, mix homogeneously；
4) to step 3) prepare mixture in add first aluminum nitride powder, be sufficiently stirred for, mix homogeneously；
5) by step 4) mixture for preparing, utilize centrifuging to solidify after getting rid of roller-compaction processed and parch, in prepared earthenware
Mould blank；
6) by step 5) prepare earthenware in mould blank lathe tool processing endoporus to meeting size；
7) under the conditions of high pure nitrogen, by step 6) in earthenware after lathe tool processing mould toast in electrical kiln and be fired into
Come out of the stove after type air cooling；Baking method for cooking is: start to be warmed up to the speed of per hour 5 DEG C 120 DEG C from room temperature, then from 120 DEG C
It is warmed up to 600 DEG C with the speed of per hour 50 DEG C, then at 600 DEG C, is incubated 6 hours, then from 600 DEG C with per hour 100 DEG C
Speed is warmed up to 950 DEG C, is warmed up to 1050 DEG C from 950 DEG C with the speed of per hour 20 DEG C, from 1050 DEG C with per hour 150 DEG C
Speed is warmed up to 1200 DEG C, is then incubated 8 hours at 1200 DEG C；
8) by step 7) baking form by a firing after earthenware in mould load inside steel pipe die crust, then at earthenware
Fill self-flow refractory castable between interior mould and steel pipe die crust, i.e. prepare this resistance to thermal shock pottery pipe die.
Described silicon carbide micro-powder includes that silicon carbide micro-powder that particle diameter is 70-140 mesh and the carborundum that particle diameter is 35-50 mesh are micro-
Powder, wherein particle diameter be 70-140 mesh percentage by weight be 30-35%, remaining is silicon carbide micro-powder that particle diameter is 35-50 mesh；Described
The particle diameter of silica flour is 500 mesh；The particle diameter of described first aluminum nitride powder is 100-200 mesh；The particle diameter of described graphite microparticles is 600-
800 mesh；The particle diameter of described zirconium oxide micropowder is 500-800 mesh；The particle diameter of described yittrium oxide micropowder is 800 mesh.
Described silicon carbide micro-powder is green or black silicon carbide silicon powder.
Described first aluminum nitride powder is the aluminum nitride powder nitrogenized the most completely, be particle diameter be that the aluminium powder of 20 mesh is through not exclusively nitridation
After, being milled down to particle diameter is the mixing fine powders prepared after 100-200 mesh, and the ratio of aluminum nitride powder contained therein is 40-60%, residue
Composition is aluminium powder.
Described binding agent is in any one and alumina cement, waterglass in polyvinyl alcohol, coal tar, spent pulping liquor
Any one combines with arbitrary proportion, and the percentage by weight sum of two kinds of components is 3-4%.
Resistance to thermal shock pottery pipe die of the present invention and preparation method thereof provides the benefit that:
1, in earthenware, under mould room temperature, compressive resistance is 45MPa, and rupture strength is 30MPa, and pressure, rupture strength exists
Less than 1500 DEG C raise with temperature and raise, the advantage with applicable high temperature service；2, in earthenware, mould is multiple to molten iron etc.
Liquid metal and melt cinder have not wellability, can add its corrosion resistance further；3, earthenware inner mold has heat accumulation function, pipe die
The temperature of inner surface will not rapid decrease, during cast tube repeatedly, tube drawing, the cold and hot temperature difference of pipe die inner surface is little, it is to avoid cold
Heat thermal cycle repeatedly, advantageously reduces thermal stress and gathers the stress corrosion cracking caused；4, earthenware inner mold has heat accumulation function,
The own thermal loss of cast tube can be reduced, and fill with refractory material between mould and steel pipe die crust in earthenware, can be more
It is effectively reduced conduction of heat, reduces cast tube thermal loss；5, in earthenware in mould production process, matrix is in compressive stress shape all the time
State, can improve its cracking resistance intensity further；6, in earthenware, mould resistance to flaking is good, only occurs spot corrosion after exceeding its operating limit
Peel off, without occurring that cracking causes catastrophic effect suddenly.
Therefore, in the earthenware that the present invention prepares, mould compressive resistance is high, rupture strength is good, high-temperature corrosion resistance performance is good
Advantage, has good resistance to heat shocks, can resist the high temperature liquid iron damage to pipe die, improves the service life of pipe die, reduces pipe
Mould cost；When using resistance to thermal shock pottery pipe die of the present invention to produce Centrifugal Casting Pipe of S. G. Iron, it is not necessary to use recirculated cooling water
Tube wall is carried out cooling protection, is possible not only to simplify the form of the composition of centrifuge, is substantially reduced manufacturing cost and the dimension of centrifuge
Repair expense, moreover it is possible to avoid recirculated water to force cooling to cause body section to be air chill state, also need to reheat annealing and obtain spheroidal graphite
The situation of cast iron pipe；After in earthenware, mould is compound with steel pipe die crust, available roller-type centrifuge produces ductile iron pipe,
The cooling water atomization plant of roller-type centrifuge has function according to cast tube temperature automatic adjustment spray amount after water atomization, can
To control the reduction of speed or constant of cast tube temperature, cast tube is made to utilize own heat by cooling rational to cast tube and preservation and controlling
Complete nodularization, save and reheat annealing operation and save the energy, reduce and pollute, and atomized water is little to the impact of molten iron level,
Vaporization heat absorption is fast, and cast tube is caught a cold uniformly, and cast tube internal stress can be made to greatest extent to be evenly distributed, and keeps the roundness of cast tube；Torr
Roll-type centrifuge is not sealed bearing by outer hoop high speed water and is limited, it is possible to increase the scope of pipe die linear velocity, produces big straight
The ductile iron pipe in footpath；In earthenware, mould can ensure, by machining, the precision installed, produces and conforms to quality requirements
Ductile iron pipe.Use resistance to thermal shock pottery pipe die of the present invention to produce ductile iron pipe and can reduce production link, save the energy, save
Equipment maintenance cost, reduces production cost, has preferable economic and social benefit, significant to metallurgical cast tube industry, tool
Have broad application prospects and promotional value.
(4) accompanying drawing explanation
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention.
In figure, mould in 1 earthenware, 2 steel pipe die crusts, 3 self-flow refractory castables.
(5) detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but the invention is not limited in this, the system in embodiment
Preparation Method is customary preparation methods, no longer describes in detail.
Embodiment 1:
This resistance to thermal shock pottery pipe die, including mould 1 in earthenware, in earthenware, mould 1 outer sheath is provided with steel pipe die crust
2, in earthenware, it is filled with self-flow refractory castable 3 between mould 1 and steel pipe die crust 2；In described earthenware mould 1 include with
The raw material of lower weight is made: silicon carbide micro-powder 4500 kilograms, silica flour 2500 kilograms, first aluminum nitride powder 2150 kilograms, graphite are micro-
200 kilograms of powder, zirconium oxide micropowder 200 kilograms, yittrium oxide micropowder double centner, dehydrated alcohol 50 kilograms, polyvinyl alcohol 150 kilograms
With waterglass 150 kilograms.
The preparation method of this resistance to thermal shock pottery pipe die, employing following steps:
1) by silica flour 2500 kilograms, zirconium oxide micropowder 200 kilograms, yittrium oxide micropowder double centner, dehydrated alcohol 50 kilograms with
150 kilograms of addition homogenizers of polyvinyl alcohol, are sufficiently stirred for, mix homogeneously；
2) to step 1) mixture for preparing adds after silicon carbide micro-powder 4500 kilograms, graphite microparticles 200 kilograms, at height
Speed blender is sufficiently stirred for, mix homogeneously；
3) to step 2) mixture for preparing adds waterglass 150 kilograms, it is stirring evenly and then adding into water, adds the weight of water
Amount is for step 2) in the 4-7% of the gross weight of mixture for preparing, be sufficiently stirred in homogenizer, mix homogeneously；
4) to step 3) prepare mixture in add first aluminum nitride powder 2150 kilograms, fully stir in homogenizer
Mix, mix homogeneously；
5) by step 4) prepare mixture, utilize centrifuging to make mixture by the effect of centrifugal force in rotary course
Being thrown to tube wall, then carry out grinding roller, rolling to it with ferrum axle, after molding, solidification parches, and prepares mould blank in earthenware；
6) by step 5) prepare earthenware in mould blank lathe tool processing endoporus to meeting size；
7) under the conditions of high pure nitrogen, by step 6) in earthenware after lathe tool processing mould toast in electrical kiln and be fired into
Come out of the stove after type air cooling；Baking method for cooking is: start to be warmed up to the speed of per hour 5 DEG C 120 DEG C from room temperature, then from 120 DEG C
It is warmed up to 600 DEG C with the speed of per hour 50 DEG C, then at 600 DEG C, is incubated 6 hours, then from 600 DEG C with per hour 100 DEG C
Speed is warmed up to 950 DEG C, is warmed up to 1050 DEG C from 950 DEG C with the speed of per hour 20 DEG C, from 1050 DEG C with per hour 150 DEG C
Speed is warmed up to 1200 DEG C, is then incubated 8 hours at 1200 DEG C；
8) by step 7) baking form by a firing after earthenware in mould load inside steel pipe die crust, then at earthenware
After filling self-flow refractory castable between interior mould and steel pipe die crust, the factors such as the pottery size of pipe die, shape are carried out sternly
Lattice detect, and after complying with product quality requirement by emery wheel grinding machine correction, i.e. prepare this resistance to thermal shock pottery pipe die.
Embodiment 2:
This resistance to thermal shock pottery pipe die, including mould 1 in earthenware, in earthenware, mould 1 outer sheath is provided with steel pipe die crust
2, in earthenware, it is filled with self-flow refractory castable 3 between mould 1 and steel pipe die crust 2；In described earthenware mould 1 include with
The raw material of lower weight is made: silicon carbide micro-powder 4000 kilograms, silica flour 2400 kilograms, first aluminum nitride powder 2390 kilograms, graphite are micro-
420 kilograms of powder, zirconium oxide micropowder 300 kilograms, yittrium oxide micropowder 50 kilograms, dehydrated alcohol 40 kilograms, 250 kilograms of coal tar and water
150 kilograms of glass.
Preparation method is with embodiment 1.
Embodiment 3:
This resistance to thermal shock pottery pipe die, including mould 1 in earthenware, in earthenware, mould 1 outer sheath is provided with steel pipe die crust
2, in earthenware, it is filled with self-flow refractory castable 3 between mould 1 and steel pipe die crust 2；In described earthenware mould 1 include with
The raw material of lower weight is made: silicon carbide micro-powder 5000 kilograms, silica flour 2100 kilograms, first aluminum nitride powder 2000 kilograms, graphite are micro-
270 kilograms of powder, zirconium oxide micropowder 220 kilograms, yittrium oxide micropowder 62 kilograms, dehydrated alcohol 28 kilograms, polyvinyl alcohol double centner and
Alumina cement 220 kilograms.
Preparation method is with embodiment 1.
Embodiment 4:
This resistance to thermal shock pottery pipe die, including mould 1 in earthenware, in earthenware, mould 1 outer sheath is provided with steel pipe die crust
2, in earthenware, it is filled with self-flow refractory castable 3 between mould 1 and steel pipe die crust 2；In described earthenware mould 1 include with
The raw material of lower weight is made: silicon carbide micro-powder 4120 kilograms, silica flour 2150 kilograms, first aluminum nitride powder 2500 kilograms, graphite are micro-
500 kilograms of powder, zirconium oxide micropowder 260 kilograms, yittrium oxide micropowder 75 kilograms, dehydrated alcohol 35 kilograms, spent pulping liquor 160 kilograms and
Alumina cement 200 kilograms.
Preparation method is with embodiment 1.
Embodiment 5:
This resistance to thermal shock pottery pipe die, including mould 1 in earthenware, in earthenware, mould 1 outer sheath is provided with steel pipe die crust
2, in earthenware, it is filled with self-flow refractory castable 3 between mould 1 and steel pipe die crust 2；In described earthenware mould 1 include with
The raw material of lower weight is made: silicon carbide micro-powder 4700 kilograms, silica flour 2000 kilograms, first aluminum nitride powder 2260 kilograms, graphite are micro-
350 kilograms of powder, zirconium oxide micropowder 240 kilograms, yittrium oxide micropowder 90 kilograms, dehydrated alcohol 20 kilograms, 200 kilograms of coal tar and height
Aluminum cement 140 kilograms.
Preparation method is with embodiment 1.
In embodiment 1-5, silicon carbide micro-powder used includes that silicon carbide micro-powder that particle diameter is 70-140 mesh and particle diameter are 35-50
Purpose silicon carbide micro-powder, wherein particle diameter be 70-140 mesh percentage by weight be 30-35%, remaining is carbon that particle diameter is 35-50 mesh
SiClx micropowder；The particle diameter of silica flour used is 500 mesh；The particle diameter of first aluminum nitride powder used is 100-200 mesh；Graphite microparticles used
Particle diameter be 600-800 mesh；The particle diameter of zirconium oxide micropowder used is 500-800 mesh；The particle diameter of yittrium oxide micropowder used is 800
Mesh；Silicon carbide micro-powder used is green or black silicon carbide silicon powder；First aluminum nitride powder used is the aluminium nitride nitrogenized the most completely
Powder, be particle diameter be the aluminium powder of 20 mesh after not exclusively nitridation, being milled down to particle diameter is the mixing fine powders prepared after 100-200 mesh, its
Contained by, the ratio of aluminum nitride powder is 40-60%, and residual components is aluminium powder；Self-flow refractory castable used be model be SF90's
Commercially available High-Alumina self-flow refractory castable；Spent pulping liquor used is commercially available prod.
Test example:
(1) service check of resistance to thermal shock pottery pipe die of the present invention:
Shandong pipe die Manufacturing Co., Ltd use the embodiment of the present invention 1 method prepare 5 120 × 80 ×
The resistance to thermal shock pottery pipe die of 6000mm specification, and the performance parameter of inspection institute's potting porcelain tube mould, record is such as table 1 below:
Each test performance parameter of table 1 embodiment 1 made resistance to thermal shock pottery pipe die
From 1100 DEG C, made pottery pipe die is put into chilling cold water, and temperature reduction of speed reaches 150 DEG C the most per second, and repeatedly 52
After secondary, there is not crackle in pottery pipe die surface.
(2) the ductile iron pipe service check that the molding of the employing embodiment of the present invention 1 made resistance to thermal shock earthenware is produced:
The embodiment of the present invention 1 made resistance to thermal shock pottery pipe die is used to use in Shandong ductile iron pipe company limited as follows
Step produces 800 ball graphite cast iron pipe goods:
1) high temperature liquid iron of 1250 to 1300 DEG C is cast into continuously by roller-type centrifuge drive high speed rotating this
In bright embodiment 1 made resistance to thermal shock pottery pipe die；
2) utilize the cooling water atomization plant of roller-type centrifuge, according to cast tube temperature automatic adjustment spray amount, control casting
The reduction of speed of pipe temperature, and at 880-920 DEG C, cast tube is incubated nodularization；
3) being extracted from resistance to thermal shock pottery pipe die by cast tube, air cooling i.e. prepares required ductile iron pipe.
Made 800 ball graphite cast iron pipes are carried out surface and internal flaw inspection, does not finds that crackle, pore etc. are bad and incline
To.
By above-mentioned assay it will be seen that resistance to thermal shock earthenware mould of the present invention has higher compressive resistance, anti-folding
Intensity and good corrosion resistance characteristic.
Investigation shows further, and traditional steel pipe die production cost is higher, and the pipe die of pipe per ton is shared out equally
Cost about 100 yuan/ton, and the resistance to thermal shock pottery pipe die of the present invention shares out equally cost about 40 yuan/ton；Use traditional steel pipe
When mould produces ductile iron pipe, centrifuge instrument is expensive, and maintenance cost is high, shares out equally cost about 30 yuan/ton, and uses carrying roller
Formula centrifuge instrument production cost is greatly reduced, and maintenance cost is the lowest, estimates about 5 yuan/ton；Additionally, due to the employing present invention
Resistance to thermal shock pottery pipe die produce ductile iron pipe can eliminate the need for annealing furnace heating anneal production link, production cost can be saved
About 500 yuan/ton.Annual whole nation ductile iron pipe yield about 3,000,000 tons, the resistance to thermal shock pottery pipe die using the present invention can be state every year
Family saves the energy 1,800,000,000 yuan, can reduce C02Discharge capacity 2.2 × 109m3, steel pipe die repair can also be avoided to cause environment dirty again simultaneously
Dye.Therefore, using resistance to thermal shock pottery pipe die of the present invention to produce ductile iron pipe and can reduce production link, save the energy, saving sets
Standby maintenance cost, reduces production cost, has preferable economic and social benefit, significant to metallurgical cast tube industry, has
Wide application prospect and promotional value.
Claims (6)
1. a resistance to thermal shock pottery pipe die, is characterized in that: include mould in earthenware, and in earthenware, mould outer sheath is provided with steel pipe
Mould crust, is filled with self-flow refractory castable between mould and steel pipe die crust in earthenware；In described earthenware, mould includes
The raw material of following percentage by weight is made: silicon carbide micro-powder 40-50%, silica flour 20-25%, first aluminum nitride powder 20-25%, stone
Ink micropowder 2-5%, zirconium oxide micropowder 2-3%, yittrium oxide micropowder 0.5-1%, dehydrated alcohol 0.2-0.5% and binding agent 3-4%；
Described first aluminum nitride powder is the aluminum nitride powder nitrogenized the most completely, be particle diameter be the aluminium powder of 20 mesh after not exclusively nitridation, levigate
The mixing fine powders prepared after being 100-200 mesh to particle diameter, the part by weight of aluminum nitride powder contained therein is 40-60%, remains into
It is divided into aluminium powder；Described binding agent is that any one in polyvinyl alcohol, coal tar, spent pulping liquor three is with alumina cement, water glass
Any one combination in both glass.
A kind of resistance to thermal shock pottery pipe die the most according to claim 1, is characterized in that: described silicon carbide micro-powder includes that particle diameter is
The silicon carbide micro-powder of 70-140 mesh and the silicon carbide micro-powder that particle diameter is 35-50 mesh, wherein particle diameter is 70-140 mesh percentage by weight
For 30-35%, remaining is silicon carbide micro-powder that particle diameter is 35-50 mesh；The particle diameter of described silica flour is 500 mesh；Described first nitridation
The particle diameter of aluminium powder is 100-200 mesh；The particle diameter of described graphite microparticles is 600-800 mesh；The particle diameter of described zirconium oxide micropowder is
500-800 mesh；The particle diameter of described yittrium oxide micropowder is 800 mesh.
A kind of resistance to thermal shock pottery pipe die the most according to claim 1, is characterized in that: described silicon carbide micro-powder is green or black
Color silicon carbide micro-powder.
4. a preparation method for resistance to thermal shock pottery pipe die as claimed in claim 1, is characterized in that: comprise the steps:
1) by silica flour, zirconium oxide micropowder, yittrium oxide micropowder, dehydrated alcohol and polyvinyl alcohol, coal tar, spent pulping liquor three
After any one mixing, stir；
2) to step 1) mixture for preparing adds after silicon carbide micro-powder, graphite microparticles, it is sufficiently stirred for, mix homogeneously；
3) to step 2) mixture for preparing adds in alumina cement, both waterglass any one, add after stirring
Entering water, the weight adding water is step 2) in the 4-7% of the gross weight of mixture for preparing, be sufficiently stirred for, mix homogeneously；
4) to step 3) prepare mixture in add first aluminum nitride powder, be sufficiently stirred for, mix homogeneously；Described first aluminium nitride
Powder is the aluminum nitride powder nitrogenized the most completely, be particle diameter be the aluminium powder of 20 mesh after not exclusively nitridation, being milled down to particle diameter is 100-200
The mixing fine powders prepared after mesh, the part by weight of aluminum nitride powder contained therein is 40-60%, and residual components is aluminium powder；
5) by step 4) mixture for preparing, utilize centrifuging to solidify after getting rid of roller-compaction processed and parch, prepared earthenware Nei Momao
Base；
6) by step 5) prepare earthenware in mould blank lathe tool processing endoporus to meeting size；
7) under the conditions of high pure nitrogen, by step 6) in after mould toasts in electrical kiln and forms by a firing in earthenware after lathe tool processing
Come out of the stove air cooling；Baking method for cooking is: start to be warmed up to the speed of per hour 5 DEG C 120 DEG C from room temperature, then from 120 DEG C with often
The speed of hours 50 DEG C is warmed up to 600 DEG C, is then incubated 6 hours at 600 DEG C, then from 600 DEG C with the speed of per hour 100 DEG C
It is warmed up to 950 DEG C, is warmed up to 1050 DEG C from 950 DEG C with the speed of per hour 20 DEG C, from 1050 DEG C with the speed of per hour 150 DEG C
It is warmed up to 1200 DEG C, is then incubated 8 hours at 1200 DEG C；
8) by step 7) baking form by a firing after earthenware in mould load inside steel pipe die crust, then mould in earthenware
And fill self-flow refractory castable between steel pipe die crust, i.e. prepare this resistance to thermal shock pottery pipe die.
The preparation method of resistance to thermal shock pottery pipe die the most according to claim 4, is characterized in that: described silicon carbide micro-powder includes
Particle diameter is the silicon carbide micro-powder of 70-140 mesh and silicon carbide micro-powder that particle diameter is 35-50 mesh, and wherein particle diameter is 70-140 mesh weight
Percentage ratio is 30-35%, and remaining is silicon carbide micro-powder that particle diameter is 35-50 mesh；The particle diameter of described silica flour is 500 mesh；At the beginning of described
The particle diameter of secondary aluminum nitride powder is 100-200 mesh；The particle diameter of described graphite microparticles is 600-800 mesh；The grain of described zirconium oxide micropowder
Footpath is 500-800 mesh；The particle diameter of described yittrium oxide micropowder is 800 mesh.
The preparation method of resistance to thermal shock pottery pipe die the most according to claim 4, is characterized in that: described silicon carbide micro-powder is green
Color or black silicon carbide silicon powder.
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